Parse Server anfällig für (SQL Injection) über die `Increment`-Operation auf einem verschachtelten Objektfeld in PostgreSQL

The SQL Injection vulnerability arises from improper handling of Increment operations on nested object fields using dot notation within the PostgreSQL storage adapter. Specifically, the amount value is directly interpolated into the SQL query without proper parameterization or type validation. This lack of security control enables an attacker who can send write requests to the Parse Server REST API to craft malicious SQL payloads. Successful exploitation allows attackers to bypass existing access controls (CLPs and ACLs) and extract any data stored within the database. The potential impact includes data breaches, unauthorized modifications, and complete compromise of the Parse Server instance. This vulnerability is particularly concerning given the potential for sensitive user data to be stored within Parse Server applications.

Organizations and developers using Parse Server for backend-as-a-service (BaaS) applications, particularly those relying on PostgreSQL for data storage, are at risk. Deployments with less stringent input validation or weaker access control policies are especially vulnerable. Shared hosting environments where multiple applications share the same Parse Server instance could also be affected, potentially impacting multiple tenants.

• nodejs / server: Monitor Parse Server logs for unusual SQL query patterns, particularly those involving dot notation in nested object fields. Look for queries containing SQL keywords or functions that are not expected in legitimate Increment operations.

grep -i 'SELECT|INSERT|UPDATE|DELETE' /var/log/parse-server.log

• database (postgresql): Review PostgreSQL audit logs for suspicious SQL queries originating from the Parse Server application. Look for queries that bypass access controls or attempt to access sensitive data.

SELECT query FROM pg_stat_activity WHERE datname = 'your_database_name';

• generic web: If Parse Server is exposed via a web interface, attempt to send Increment requests with non-numeric values in the amount field and monitor the server's response for error messages or unexpected behavior.

1. 2026-03-11Disclosure

   disclosure

1. Reserviert2026-03-09
2. Veröffentlicht2026-03-11
3. Geändert2026-03-13
4. EPSS aktualisiert2026-03-23

The primary mitigation for CVE-2026-31856 is to immediately upgrade Parse Server to version 9.6.0-alpha.3 or later. This version includes type validation to reject non-number values and parameterizes the value, effectively preventing SQL Injection. If upgrading is not immediately feasible, consider implementing a Web Application Firewall (WAF) with rules to filter potentially malicious SQL queries targeting the Increment endpoint. Thoroughly review and validate all input data related to nested object fields to ensure it conforms to expected data types. Monitor Parse Server logs for unusual SQL query patterns that might indicate an attempted exploitation.